CVE-2010-4344

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS

71.90% chance of exploitation in the next 30 days, 99th percentile

CISA KEV

added 2022-03-25

Published

2010-12-14

Updated

2025-10-22

Proof-of-concept exploits (1)

• http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_format

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/unix/smtp/exim4_string_format.rb

ExploitDB entries (2)

• https://www.exploit-db.com/exploits/16925
• https://www.exploit-db.com/exploits/15725

References

• CVE Record
• NVD entry

Related

• CVE-2010-4335
• CVE-2010-4345
• CVE-2010-4333
• CVE-2010-4347
• CVE-2010-4332
• CVE-2010-4348